package chapter05.Example10;

import java.io.IOException;
import java.util.Random;

public class Example10 {
    public static void main(String[] args) throws IOException {
        //System类
        long time = System.currentTimeMillis();
        System.out.println("time = " + time);
        //Runtime类
        Runtime rt = Runtime.getRuntime();
        rt.exec("notepad.exe");
        //Math类
        System.out.println(Math.random());
        System.out.println(Math.PI);
        //Random类
        Random random=new Random();
        for(int i=0;i<10;i++){
            random.nextInt(56);
        }
    }
}
